Fig. 17From: Chronology of the 2015 eruption of Hakone volcano, Japan: geological background, mechanism of volcanic unrest and disaster mitigation measures during the crisisSequential change of 15-1 crater. a Soon after the eruption, a mud pool formed in the bottom of the crater and vigorous fountaining of mud (arrow) was observed. b A sudden and transient explosion at 15-1 crater on 12:01 of July 21, 2015. c Boiling mud pool formed within 15-1 crater. d Fumaroles formed after a landslide that took place in August 2016Back to article page